Cutting segment with porous center section

Abstract

A cutting segment for stone and the like, the segment having a porous center section. A conventional mixture of cement and diamonds is made, and a quantity of filler is added to the mixture. The filler will withstand the sintering process, but subsequently falls out so pores are provided. A segment is made with only the center porous, while the side sections are as dense as is conventional. The result is that the porous section can receive coolant and/or the resulting slurry for efficient cutting, and the center section wears faster to yield a concave cutting edge.

I claim: 
     
       1. In a stone cutting segment, wherein said segment is formed of a cement having diamonds dispersed therein, said segment having a cutting edge, side sections arranged perpendicularly to said cutting edge, and a center section disposed between said side sections so that said side sections and said center section form said cutting edge, both said side sections and said center section being formed of said cement having diamonds dispersed therein, the improvement wherein said center section includes a relatively soft material as compared to said cement dispersed therein, said relatively soft material being within a plurality of individual pores substantially uniformly distributed throughout said center section, said relatively soft material filling all said pores. 
     
     
       2. In a stone cutting segment as claimed in claim 1, the further improvement wherein pores substantially at said cutting edge will have said relatively soft material dislodged therefrom during cutting for defining pores for receiving liquid during such cutting. 
     
     
       3. In a stone cutting segment as claimed in claim 2, the improvement wherein said relatively soft material consists of graphite.